Francis h



(No Model.)

P. H. RICHARDS.

CENTER DRILLING MACHINE.

Q aw RC mm mm .88

Patented 001:. Z, 1888.

'lUNrrED STATES Parnnr CrFrcn.

FRANCIS H. RICHARDS, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE PRATT & VVHITNEYCOMPANY, OF SAME PLACE.

CENTER-DRILLENG MACHINE.

SPECIFICATION forming part of Letters Patent No. 390,520, dated October 2,1888.

Application filed July 23,1888. Serial No. 280,165. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS H. RICHARDS, a citizen of the United States, residing at Hart ford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Center-Drilling Machines,of which the following is a specification.

This invention is in the nature ofan improvement on the invention described in United States Patent No. 376,838, dated January 24, 1888.

In the drawings, Figure 1 is a plan or top view of a drilling-machine embodying my improvements. Fig. 2is a front elevation of the head portion of the same. Fig. 3 is asectional elevation in line a a, Fig. 2. Fig. 4 is a similar view in line b b, Fig. 2, showing the rocking spindle-head. Fig. 5 is a side elevation, partially in section, of the vise for holding the piece tobe drilled. Fig. 6 is a cross-sectional view of the rest-slide.

Similar characters designate like parts in all the figures.

The frame or bed of the machine may have any construction suitable for carrying the several parts thereon. In the drawings such a bed is designated in a general way by B. Said bed has suitable bearings for the shaft orpivotbolt 37, on which the spindle-head H swings. Said head has bearings and 61 for spindlesleeves E and F, respectively; also bearings 62 and 63 for the sleeves of pulleys 34 and 33, respectively. Said head has bearings in the end walls or arms, 64 and 66, for the 1ock-bolt 28 and a guide-bar, 68, for the hand-lever Q.

0n the under side of sleeves E F are amxed suitable cross-heads,as 38 and 39, respectively, through which said sleeves are operated. The cross-heads may be fitted against the under side (or edges) of bearings 60 61, as shown in Fig. 3, thereby serving as stops for preventing any rotation of said sleeves in the head H. A sliding clutch-arm, 52, is constructed to slide on the pin or shaft 37 (or on some other part not shown) and to engage at its upper end with said cross-heads. This will best be seen from Figs. 2 and 3. Said clutch-arm is operated by the lever Q through a pin, 54, fixed in said lever and engaging between the ordinary flanges, 55, of arm 52. The lever Q is or may be pivoted at 53 to the lug 56, formed on the arm 66 of head H. Being thus pivoted and working in the slot in guide-bar 68, said lever Q serves as a lever for swinging the head H on its pivot 37, and serves such purpose independently of its own movement in said guidebar. The arm does not swing on said pivotshaft, but is (or may be) held from such movement by a guide-arm, 46, projecting from said arm 52 and working in a slot in the bed B, as shown in said Figs. 2 and 3. By means of the construction above described, when the crossheads 38 39 stand in the same vertical plane, the head H may be swung forward (as not shown) or backward, as shown in Fig. 3, to bring either of said cross-heads into engagement with the clutoh arm 52, and in this way either sleeve E or F may be operated in said head H independently of the other said sleeve.

For the purpose of limiting the lateral movement of head H to the time when both sleeves are drawn back, and also to lock and unlock said head, the aforesaid lock-bolt 28 is provided. This bolt is operated from the lever Q by means of the dog 47, fixed on said bolt. The lever on being thrown back (toward the right hand in Figs. 1 and 2) strikes said dog and draws the said bolt out of the hole 2 or 4, as the case may be, in the stop-plate 51,which plate is fixed or formed on bed 13. A spring on the bolt 28 between arm 64 and dog 47 (and indicated by dotted lines at 15 in Fig. 2) serves in a well-known manner to force said. bolt forward.

The sleeves E F constitute sliding bearings for the spindles C D, respectively, and these spindles are splined in the usual manner to be driven from and to slide through the pulleys 34 and 33, respectively, which pulleys may bedriven bybelts. (Notshown) Thespindles C D are provided with collars 81 and with collar-nuts 88 89, for holding them from longitudinal movement in their said sliding bearings.

As shown in the drawings, spindle C has a drill-chuck, 84, for holding the center drill 86, and spindle D has the reamer fixed therein. It is not material, however, which spindle carries the reamer, and other kinds of boring-tools may be substituted for those shown.

For holding the pieces to be drilled I emvise M.

ploy the vise M,which is (or may be) the same as the vise described in detail in the aforesaid patent. This vise (and others of the same class) has two slides, 8 and 9, carrying the vise-jaws 5 and 6, respectively. The said slides are operated in the usual manner by a screw-shaft .and hand-wheel or the like.

The outer end of the bar 14, Fig. 6, to be drilled is supported by a rest, T, consisting of the base 22, through which passes the stem 23 of the Vshaped support B. On one side of said stem there is a rack, 25, meshing with the pinion 26 on the splined shaft 27, which shaft has one bearing in said part 22, through which it slides,and is journaled in the base 31 of the Said shaft is driven by a gear, 30, fixed on said shaft and meshing with the rack 29, fixed on slide 9. By means of this apparatus the motion of slide 9 revolves the shaft 27 to correspondingly raise or lower the rest R, the proportions of the gearing being so calculated as to be suitable therefor. The pinion 26 being splined to said shaft 27 and carried in a slot, 32, in the base 22, the rest T is free to be moved toward or from the vise, as may be required. Thus the rest or V Ris automatically adjusted to be always conformable to the position of the vise-jaws.

In using niyimproved drilling-machine the piece to be drilled is properly clamped in'the vise and supported on the said rest, and the drilling-tools are suitably aflixed to or in the respective spindles. The head H is then looked in one of its positions, as shown, for instance, in Figs. 1, 2, and 3, thus bringing the drill 86 in position for use. The spindles being now revolving, the handle 24 is carried forward,(toward theleit hand in said figures,) thereby forcing the spindle 0 forward and the drill into the piece held in the vise. On returning the handle the drill is withdrawn, the bolt 28 retracted from its engagement with thelockplate 51, and the cross-head 38 brought into alignment with cross-head 39. At this time the head H is free to be swung over to its other position, ready for using the opposite spindle, D, in like manner. Having thus described my invention, I claim- 1. The combination, in a drilling-machine, of a laterally-movable head carrying two revolving and sliding spindles, a lever pivotally mounted on said head,whereby the head may be swung laterally on its pivot, and a connecting eluteharm and cross-heads, substantially as described, whereby the spindles are operated one at a time from said lever, all sub stantially as set forth.

2. The combination, in a drilling-machine, with the laterally-movable head carrying two revolving and sliding spindles carried in sliding bearings, each provided with a cross-head, of thesliding non-swinging clutcharm, alever connected to actuate said clutch-arm serving at the same time to shift said head and the lock-bolt and lockplate, the lock-bolt being operated by said lever on its return stroke, all substantially as set forth.

3. The combination, in a laterally-movable drilling-machine head, ofspindles O D, sleeves E F, having cross heads 38 39, respectively, clutch-arm 52, arranged to slide but not to move laterally with said head, and the lever Q, constructed and arranged to operate said clutch-arm independently of the lateral movement of said head, all substantially as de scribed.

4. The combination, with the bed B, of the vise and the rest, one movable toward and from the other on said bed, said rest having a vertically-movable support, It, and the horizontal shaft operatively connected to said vise and rest by gearing, substantially as described, to actuate said rest from the vise, substantially as described.

5. The combination, with the vise M and with the shaft 27, operatively connected to be operated from said vise, of the base 22, carrying the stem 23, provided with rack-teeth, and having the slot 32 and the pinion 26, carried by said shaft in said slot and meshing with said rack-teeth, substantially as described.

FRANCIS H. RICHARDS.

Witnesses: I

GEo. W. DRAKE, HENRY L. RIOKARD. 

